Electrode-terminal for electric heaters.



l U. TOBLBR. ELEGTRODB TERMINAL POR ELECTRIC HEATERS.

APPLIUATION FILED JAN.15. 1914.

Patented June 23, 191i UNITED STATES PATE OFFICE.

ULEICH TOBLER, OF PFORZHEIM, GERMANY, ASSIGNOR TO THE FIRM 0F BROCKDORFF- WI'IZENMANN M. B. H., OF BERLIN, GERMANY.

ELECTRODE-TERMINAL FUR ELECTRIC HEATERS.

T0 all 'whom it may concern.'

Be it known that l, ULRICH TonLnn, citizen of the Confederation of Switzerland, residing at Pforzheim, Germany, have invented certain new and useful Improvements in ElectrodeTermina-ls for Electric Heaters, of which the following is a specification.

This invention relates to electric fluid heaters, as for example electric steam genern ators, and relates more particularly to an improved terminal or binding post for securing the current conductor or lead, which conduct-s the current to the terminal, to the heater casing.

My invention relates to that type of terminal in which the lead, which passes through an aperture in the heater casing, is surrounded by insulating tube of porcelain or the like which is secured to the heater casing. v

The object, of the present invention is to provide a terminal which dispenses with the necessity oi' cemented joints and thus enables high pressures and high temperatures to generated .in the heater' without the, v anger oit leakage occurring at the ter the i* rts constituting the terminal ourpose provided with tluid tight packed joints which will, however, allow a certain amount, of play so to permit oil the expansion of the different. parts on an increase in temperature.

The preferred construction of my iinprored terminal is illustrated on the accompanying drawing in section.

The current'is supplied to the terminal by way ot the binding post` a of a conduct-or or lead h which may consist of a brass wire or rod, the' current 'passing from the terminal through the liquid to be heated to the second tern'iinal. The lead passes through the casing Z of the heater, and is insulated by a surrounding insulating tube c preferably ot' porcelain, the tube c also passing through the casing Z and being surrounded by a hood or cover Z secured tothe casing Z so as to close the aperture therein. The upper end et the hood or cover (Z is recessed internally to iorm a shoulder (V,- an enlarged part c" e porcelain tube c fitting upon this so as to support the porcelain t le screwed on to the lower or cover CZ guides the tube A.

Specication of Letters Patent.

Application sled January 15, 1914.

Patented June 23, 1914.

Serial No. 812,276.

Huid-tight joint is formed between the upper end of the hood d and the porcelain tube c by means of a packing c adapted to be compressed by means of a gland m. lf desired, as shown on the drawings, a second packing f may be :inserted between the gland 7nand the tube c and this packing compressed by means of a gland n.

vWelded upon the lead Z) is a ring g adapted to fit against an internal shoulder a formed in the tube c, a packing ring h being interposed between the ring g and shoulder s. The ring h is pressed firmly against lthe packing ring p which in turn bears against the shoulder s by means of a nut z' on the end of the lead ZJ and also by the pressure within the heater, thus preventing leakage.

lt. will be understood that the terminal described herein is such as may be used :tor heating liquids to a very high temperature and it is to be understood that the terminals may be pla on'veniently upon the vessel containing .ids to be heated, a .por-

tion of the vessel being indicated at Z in the drawings.

l' claim:

l. ifi. terminal for electric fluid heaters in which the lead passes through an aperture .in the heater casing, comprising an insulating member surrounding said lead, a fluidtigl'it joint interposed between said lead and member, a cover over said aperture and through which said member passes and a fluid-tight expansible joint between said cover and member.

2. A terminal for electric fluidl heaters in which the lead passes through an aperture in the heater casing, comprising` an insulating member surrounding said lead, packing forming a fluid-tight joint between said lead and member, a cover over said aperture and through which said member passes and packing 'forming a {luid-tight joint between said cover and member.

3. A terminal for electric fluid heaters in which the lead passes through an aperture in the heater casing. comprising a ring on said lead, an insulating tube surrounding said lead and having an, internal shoulder, packing between said shoulder and ring. a cover over said aperture and through which said tube passes and a duid-tight joint be tween coiy r and tube.

4:. .it terminal for electric fluid heaters in which the lead passes through an aperture in the heater casing, comprising an insulating member surrounding said lead and having an enlarged part, a fluid-tight joint bev tween said lead and member, a tubular member secured to the heater casing and fit-ting said aperture, said tubular member having an internal shoulder adapted to receive said enlarged part, packing between the outer ends of said insulating member and tubular member and a gland for compressing said packing.

5. A terminal for electric fluid heaters in which the lead passes through an aperture in the heater casing, comprising a ring on said lead, an insulat-ing tube surrounding said lead and having an internal shoulder, packing between said shoulder and ring, an enlarged exterior part on said' tube, a tubular cover secured to the heater casing and fitting said aperture, said cover havingA an internal shouldered recess at its outer end adapted to receive the enlarged part of the tube, packing in said recess and glands for compressing said packinof.

In testimony whereof I have aixed my signature in presence of two Witnesses.

ULRICH TOBLER. Witnesses:

JOHANN Gruss, Jr., FRITZ GRAF.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

